Transcription of Highway Engineering Field Formulas
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Highway Engineering Field Formulas
M 22-24 Highway Engineering Field Formulas Metric (SI) or US Units Unless otherwise stated the Formulas shown in this manual can be used with any units. The user is cautioned not to mix units within a formula . Convert all variables to one unit system prior to using these Formulas . Significant Digits Final answers from computations should be rounded off to the number of decimal places justified by the data. The answer can be no more accurate than the least accurate number in the data. Of course, rounding should be done on final calculations only. It should not be done on interim results. Persons with disabilities may request this information be prepared in alternate forms by calling collect (360) 664-9009.
7 Nomenclature For Vertical Curves G1 & G2 Tangent Grade in percent A The absolute of the Algebraic difference in grades in percent BVC Beginning of Vertical Curve EVC End of Vertical Curve VPI Vertical Point of Intersection L Length of vertical curve D Horizontal distance to any point on the curve from BVC or EVC E Vertical distance from VPI to curve
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